Currently, these buffs only add a gathering attempt if you're already done one or more attempts. If you use it before that, you just lose 300 GP.
It's especially annoying when you're using quick gathering because you have to switch out of quick mode, hit the node once, then apply the buff, then turn quick gathering on again, or click through the remaining hits.
Please, let these buffs just add one gathering attempt at the start, even if we haven't used any yet.